Bobylyov E.E., Klokova N.L. 2020 Vol. 22 No. 1

OBRABOTKAMETALLOV Vol. 22 No. 1 2020 63 EQUIPMENT. INSTRUMENTS References 1. Il’in A.A., Stroganov G.B., Skvortsova S.V. Pokrytiya razlichnogo naznacheniya dlya metallicheskikh materialov [Coatings of various purposes for metallic materials]. Moscow, Al’fa-M Publ., Infra-M Publ., 2013. 144 p. ISBN 978-5-98281-355-8. 2. Grigor’ev S.N. Metody povysheniya stoikosti rezhushchego instrumenta [Methods to improve the durability of the cutting tool]. Moscow, Mashinostroenie Publ., 2011. 368 p. ISBN 978-5-94275-591-1. 3. Bobzin K. High-performance coatings for cutting tools. CIRP Journal of Manufacturing Science and Technology , 2017, vol. 18, pp. 1–9. DOI: 10.1016/j.cirpj.2016.11.004. 4. Caliskan H., Panjan P., Curbanoglu C. Hard coatings on cutting tools and surface fi nish. Reference Module in Materials Science and Materials Engineering. Comprehensive Materials Finishing , 2017, vol. 3, pp. 230–242. DOI: 10.1016/B978-0-12-803581-8.09178-5. In fl uence of Diffusion Saturation from Liquid Metal media Solutions to Mechanical Properties of Hard Alloy Cutting Tool Eduard Bobylyov a, * , Natalya Klokova b Kuban State Technological University, 2 Moskovskaya st., Krasnodar, 350072, Russian Federation a https://orcid.org/0000-0001-7754-1807, ebobylev@mail.ru ; b https://orcid.org/0000-0001-5781-7829, msat_kubgtu@mail.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2020 vol. 22 no. 1 pp. 54–64 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2020-22.1-54-64 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 07 December 2019 Revised: 19 December 2019 Accepted: 30 January 2020 Available online: 15 March 2020 Keywords : Carbide-tipped tool Diffusion titanium coatings Tool life Mechanical properties Titanium carbide Funding The work was supported by the Russian Foundation for Basic Research (contract No 18-38-00382). ABSTRACT Introduction. One of the most popular ways to increase operational properties of cutting carbide-tipped tool is applying functional coatings on its surface. At the same time, coatings based on titanium carbide TiC are widely used. A suf fi ciently high scienti fi c and practical interest, from the point of view of the formation of functional coatings, is the technology of diffusion metallization of cutting tools made of hard alloys in Pb-Bi-Li-Ti melts, which can signi fi cantly increase its resistance. However, the effect of functional coatings based on titanium carbide TiC on the mechanical properties of hard alloys is described insuf fi ciently. The purpose of the work is to analyze the effect of diffusion saturation of a carbide cutting tool in a Pb-Bi-Li-Ti medium on its mechanical characteristics. The methods of investigation are the following: tests for macro- and microhardness, studies of fl exural strength, impact strength and fracture toughness. Results and Discussion. It is revealed that the formed functional diffusion layers affect the mechanical characteristics of coated instruments. In this case, the main in fl uence on the mechanical properties of the coated products is exerted by the temperature of diffusion saturation and its duration. When forming diffusion layers with a thickness of up to 5 μ m for VK alloys, the fl exural strength, impact strength and fracture toughness gradually increase, with a further increase in thickness, the above characteristics decrease, for TK alloys the thickness is 4 μ m. It is found that the application of diffusion titanium coatings can increase such mechanical characteristics of carbide tools as hardness (up to 91 HRA), tensile strength in bending (for 9%WC- 15%TiC-6%Co – 1380 MPa, for 92%WC-8%Co – 1875 MPa), impact strength (for 79%WC-15%TiC-6%Co – 2.99 kJ/m 2 , for 92%WC-8%Co – 5.97 kJ/m 2 ) and fracture toughness (for 79%WC-15%TiC-6%Co – 7.65 MPa, for 92%WC-8%Co – 11.9 MPa). For citation: Bobylyov E.E., Klokova N.L. In fl uence of Diffusion Saturation from Liquid Metal media Solutions to Mechanical Properties of Hard Alloy Cutting Tool. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2020, vol. 22, no. 1, pp. 54–64. DOI: 10.17212/1994-6309-2020-22.1-54-64. (In Russian). ______ * Corresponding author Bobylyov Eduard Ed. , Senior Lecturer Kuban State Technological University, 2 Moskovskaya st., 350072, Krasnodar, Russian Federation Tel. : +7-918-975-8933 ; e-mail : ebobylev@mail.ru